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Oh, that part was more directed at ed007, since he mentioned above that he still suspects the USB controller. It just doesn't match my experiences with broken USB controllers.
As an aside note: I agree that USB controllers are quite notorious for breaking due to bad electrical design. A hacker friend of mine goes as far as saying "USB simply does not work". However, I think hardware designers have learned and now have some diodes in place that care for the worst electrostatical surges. This is somewhat mandatory as nowadays, USB controllers tend to be part of the SoC (and they are for Kindles). Note that the MMC is not - however, I wouldn't go as far as recommending to desolder the eMMC chip and replace it by another. At least if you never did SMD soldering before.
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